After the object loads, on the bottom right, there is what should be, a clickable go fullscreen button. When clicking, it wont take our embeded Unity object into fullscreen. However, when we visit the url for where the object actually lives, (https://mcohen6.github.io/CustomCables/) the button IS clickable successfully. I tried styling the button (within Unity's options) to have a z-index of 1000, but this didn't work either.
Any suggestions would be super top-shelf appreciated!